use protobuf codegen enhancements

[tanmaykm]

Use updated ProtoBuf.jl that:

• does not depend on service generation flags for other languages, removed corresponding checks here
• allows service parameters that are nested message structs

[codecov-io]

Codecov Report

Merging #7 (9e67593) into main (12c08f3) will increase coverage by 1.16%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
+ Coverage   95.78%   96.95%   +1.16%     
==========================================
  Files           4        5       +1     
  Lines         190      230      +40     
==========================================
+ Hits          182      223      +41     
+ Misses          8        7       -1     

Impacted Files	Coverage Δ
src/generate.jl	95.00% <ø> (+0.63%)	:arrow_up:
src/grpc.jl	100.00% <0.00%> (ø)
src/gRPCClient.jl	100.00% <0.00%> (ø)
src/limitio.jl	100.00% <0.00%> (ø)
src/curl.jl	96.19% <0.00%> (+1.25%)	:arrow_up:

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